title: Leaching experiments on the release of heavy metals and PAH from soil and waste materials.
abstract: Leaching tests are fundamental tools for the assessment of long-term impact of contaminated waste materials on the soil-groundwater pathway. Experiments were carried out in the framework of standardization and validation of column percolation and batch test procedures, in particular concerning the stipulation of the experimental setup. The colloid release of column and batch experiments was compared and the influence of different column filling heights (12.5-50 cm) on the release of polycyclic aromatic hydrocarbons (PAH) from soil was studied, as well as the effect of varying contact times (2.5-16 h) on the release of chromium from construction and demolition (C&D) waste and municipal solid waste incineration (MSWI) bottom ash. The results indicate that filtration of the eluate, which is required for batch tests, does not always allow the simulation of the actual colloid amount in soil pore water. Medium column heights four times the inner diameter of the column seemed to provide reasonable equilibrium adjustment conditions and avoid major biodegradation. The release of chromium was only marginally affected by the contact time, varied between 0.115 and 0.150 mg/kg for demolition waste eluate at a liquid-to-solid ratio of approximately 5L/kg.
authors.affiliation: BAM Federal Institute for Materials Research and Testing, 4.3 Waste Treatment and Remedial Engineering, Unter den Eichen 87, 12200 Berlin, Germany. oliver.krueger@bam.de
authors.forename: O
authors.initials: O
authors.lastname: Krüger
authors.forename: U
authors.initials: U
authors.lastname: Kalbe
authors.forename: W
authors.initials: W
authors.lastname: Berger
authors.forename: F G
authors.initials: FG
authors.lastname: Simon
authors.forename: S López
authors.initials: SL
authors.lastname: Meza
mesh_terms: D019216:Metals, Heavy / Q000737:chemistry*; D011083:Polycyclic Compounds / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D011083:Polycyclic Compounds; D012989:Soil Pollutants